There is a very interesting discussion:
on this report:
for a link to the original article.
A couple of correspondents tried to see the correlation to tax rates and murder rates. Unfortunately, the list has only 34 counntries. The two countries that I am most familiar with, Australia and India, are not on the list. The survey is confined to some western countries. A follow up post:
Pharyngula has a list of books on evolution here: